Sylvicanthon proseni is a species of beetle of the family Scarabaeidae. It is widespread in the Amazon Basin.
Description Adults reach a length of about . The head, pronotum, elytra, pygidium, and underside (including the ventral surface of femora) with a diffuse shine. The head, pronotum and pygidium have a blue, purple or greenish reflections. In some specimens, the pronotum has a strong olive green shine. The elytra are dark and have a silky aspect, usually dark blue or purple, but in some specimens, they are totally black or have greenish reflections. The meso- and metafemora are dark brown and usually with greenish reflections.
Taxonomy It was treated as a synonym of Sylvicanthon aequinoctialis since 1977, but was reinstated as a valid species in 2018.
Etymology The species is named after the Argentinian entomologist Alberto F. Prosen.
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